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Copyright © 2015 by The Geochemical Society of Japan. gamation of the Yinshan Block to the north and the Ordos Block to the south (Zhao et al., 2005; Zhai et al., 2005; Wan et al., 2006a; Xia et al., 2006; Guo et al., 2011; Yin et al., 2011). According to Nd and Hf isotopic studies, the main continental crustal growth and the strongest mantle extraction of the NCC occurred at ca. 2.8–2.7 Ga (Wu et al., 2005; Yang, J. et al., 2009; Geng et al., 2011), and 95% of the present crustal volume of the NCC was generated before ca. 1.0 Ga (Yang, J. et al., 2009). The strongest magmatic events in the NCC occurred at ca. 2.5 Ga (Zhao et al., 2002; Wilde and Zhao, 2005; Zhai et al., 2005; Wan et al., 2010a, 2011), and the subordinate magmatic event occurred at ca. 1.85 Ga (Zhao et al., 2001; Kröner et al., 2005; Wilde and Zhao, 2005; Wan et al., 2006b). During this time, a large amount of depleted mantle material was added to the continental crust of the NCC (Liu et al., 2007; Geng et al., 2011; Zhang et al., 2012; Wang et al., 2012; Diwu et al., 2012). The primary period of NCC continental crust growth (2.8–2.7 Ga or 2.5 Ga) remains highly controversial. An Nd isotopic study revealed that the best estimate for the age of the NCC mantle extraction is ca. 2.8–2.7 Ga (Wu et al., 2005), which is consistent with Hf isotopic results (Xia et al., 2006; Yang, J. et al., 2009; Geng et al., 2011; Evolutionary history of Precambrian continental crust in the North China Craton